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a) \(\left(x-9\right)^4=\left(x-9\right)^7\)
\(\Rightarrow\left[{}\begin{matrix}x-9=1\\x-9=0\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=10\\x=9\end{matrix}\right.\)
b) \(\left(3x-15\right)^{10}=\left(3x-15\right)^{15}\)
\(\Rightarrow\left[{}\begin{matrix}3x-15=0\\3x-15=1\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{15}{3}\\x=\dfrac{16}{3}\end{matrix}\right.\)
c) \(\left(x-8\right)^3=\left(x-8\right)^6\)
\(\Rightarrow\left[{}\begin{matrix}x-8=0\\x-8=1\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=8\\x=9\end{matrix}\right.\)
179 - 58 + 15 + 58 - 75
= 121 + 15 + 58 - 75
= 136 + 58 - 75
= 194 - 75
= 119
( -5 ) * 9 * 2 * 15
= ( -45 ) * 2 *15
= ( -90 ) * 15
= -1350
159 * ( -13 ) - ( -13 ) * 59
= ( -13 ) * ( 159 - 59 )
= ( -13 ) * 100
= -1300
( -109 ) - ( -2 )^3 * ( 6 - 7 )
= ( -109 ) - ( -8 ) * ( -1 )
= ( -109 ) - 8
= -117
a,(-12).x= 60-12
(-12).x=48
x=48:(-12)
x = -4
b,(-5).x + 5 = -24+6
(-5).x + 5 = 30
(-5).x = 30-5
(-5).x = 25
x = 25 : (-5)
x = -5
c,
a, `(x-9)^4=(x-9)^7`
`(x-9)^4-(x-9)^7=0`
`(x-9)^4 . [(1-(x-9)^3]=0`
TH1: `(x-9)^4=0`
`x-9=0`
`x=9`
TH2: `1-(x-9)^3=0`
`(x-9)^3=1^3`
`x-9=1`
`x=10`
b, `(3x-15)^10=(3x-15)^15`
`(3x-15)^10 . [1-(3x-15)^5]=0`
TH1: `(3x-15)^10=0`
`3x-15=0`
`x=5`
TH2: `1-(3x-15)^5=0`
`(3x-15)^5=1^5`
`3x-15=1`
`x=16/3` (Loại)
c, `(x-8)^3=(x-8)^6`
`(x-8)^3 .[1-(x-8)^3]=0`
TH1: `(x-8)^3=0`
`x=8`
TH2: `1-(x-8)^3=0`
`x-8=1`
`x=9`
x=6 nha
7x - 15 = 9 x 3
7x - 15 = 27
7x = 27 + 15
7x = 49
x = 49 : 7
x = 7